Rajić-Savić, Nataša

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  • Rajić-Savić, Nataša (6)
  • Rajić Savić, Nataša (1)
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Author's Bibliography

Activity of some plant essential oils against common isolates in veterinary bacteriology - a pilot study

Zdravković, Nemanja; Radanović, Oliver; Ninković, Milan; Savić Radovanović, Radoslava; Rajić-Savić, Nataša; Marjanović, Đorđe; Bojkovski, Jovan

(Institute for Animal Husbandry, Belgrade-Zemun, Serbia, 2021)

TY  - CONF
AU  - Zdravković, Nemanja
AU  - Radanović, Oliver
AU  - Ninković, Milan
AU  - Savić Radovanović, Radoslava
AU  - Rajić-Savić, Nataša
AU  - Marjanović, Đorđe
AU  - Bojkovski, Jovan
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2311
AB  - Antimicrobial therapy is important tool in fighting infectious
diseases. The significance of the role of antimicrobials in nature remains vastly
uninvestigated. Plants produce secondary metabolites for, among other functions,
natural protection against microbial infection. The aim of this research was to
investigate antimicrobial effects of 5 different essential oils and 5 main constituents
of plant essential oils toward some of the common veterinary microbial pathogens.
Plant etheric oils (EO) of oregano (Origanum vulgare L.), black caraway (Nigella
sativa L.), sandalwood (Santalum album L.), peppermint (Mentha balsamea Wild.)
and eucalyptus (Eucalyptus obliqua L'Hér.) and active components of etheric oils:
D-limonene, D-α pinene, thymol, carvacrol and cynamaldehyde were tested for
antimicriobial activity against referent strains of: Staphylococcus aureus,
Methicilin resistant S. aureus (MRSA), Escherichia coli; as well as against clinical
isolates of: Staphylococcus pseudintermedius, E. coli, Pseudomonas aeruginosa
and yeast Candida sp. For each etheric oil and active compound minimal inhibitory
concentrations (MIC) are observed by method of broth microdilution. Results of
these investigations have shown that active components of the EO have stronger
antimicrobial effect than complete formulation of essential oils used in the study.
Among tested EOs the most potent was the peppermint etheric oil, while carvacrol
showed the strongest antimicrobial effect among active components of EO.
Interesting finding is that there was almost no difference among MICs between
referent S. aureus and MRSA.
AB  - Antimikrobna terapija je važno sredstvo u borbi protiv zaraznih bolesti. Značaj
uloge antimikrobnih sredstava u prirodi ostaje neistražen zbog prilagođavanja
patogena različitim oblicima rezistencije. Biljke proizvode sekundarne metabolite,
između ostalog i za prirodnu zaštitu od mikrobne infekcije. Cilj ovog istraživanja
bio je istražiti antimikrobne efekte 5 različitih esencijalnih ulja i 5 glavnih
sastojaka biljnih etarskih ulja na neke od uobičajenih veterinarskih mikrobnih
patogena. Biljna eterična ulja (EO) origana (Origanum vulgare L.), crnog kima
(Nigella sativa L.), sandalovine (Santalum album L.), nane (Mentha balsamea
Wild.) i eukaliptusa (Eucalyptus obliqua L'Hér.) kao i aktivnih komponenti: Dlimonen,
D-α pinen, timol, karvakrol i cinamaldehid testirani su na antimikrobnu
aktivnost protiv referentnih sojeva: Staphylococcus aureus, S. aureus rezistentne na
meticilin (MRSA), Escherichia coli kao i protiv kliničkih izolata: Staphylococcus
pseudintermedius, E. coli, Pseudomonas aeruginosa i kvasca Candida sp. Za svako
eterično ulje i aktivno jedinjenje dobijene su minimalne inhibitorne koncentracije
(MIK) mikrodilucionom metodom u bujonu. Rezultati su pokazali da aktivne
komponente EO imaju jači antimikrobni efekat od EO sa istom odgovarajućom
dominantnom komponentom. Među testiranim EO najmoćnije je bilo eterično ulje
nane, dok je karvakrol pokazao najjači antimikrobni efekat među aktivnim
komponentama EO. Zanimljiv nalaz je da gotovo nije bilo razlike među MIK
između referentne S. aureus i MRSA.
PB  - Institute for Animal Husbandry, Belgrade-Zemun, Serbia
C3  - 13th International Symposium: Modern trends in livestock production
T1  - Activity of some plant essential oils against common isolates in veterinary bacteriology - a pilot study
T1  - Aktivnost nekih biljnih eteričnih ulja protiv čestih izolata u veterinarskoj bakteriologiji - pilot studija
SP  - 552
EP  - 560
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2311
ER  - 
@conference{
author = "Zdravković, Nemanja and Radanović, Oliver and Ninković, Milan and Savić Radovanović, Radoslava and Rajić-Savić, Nataša and Marjanović, Đorđe and Bojkovski, Jovan",
year = "2021",
abstract = "Antimicrobial therapy is important tool in fighting infectious
diseases. The significance of the role of antimicrobials in nature remains vastly
uninvestigated. Plants produce secondary metabolites for, among other functions,
natural protection against microbial infection. The aim of this research was to
investigate antimicrobial effects of 5 different essential oils and 5 main constituents
of plant essential oils toward some of the common veterinary microbial pathogens.
Plant etheric oils (EO) of oregano (Origanum vulgare L.), black caraway (Nigella
sativa L.), sandalwood (Santalum album L.), peppermint (Mentha balsamea Wild.)
and eucalyptus (Eucalyptus obliqua L'Hér.) and active components of etheric oils:
D-limonene, D-α pinene, thymol, carvacrol and cynamaldehyde were tested for
antimicriobial activity against referent strains of: Staphylococcus aureus,
Methicilin resistant S. aureus (MRSA), Escherichia coli; as well as against clinical
isolates of: Staphylococcus pseudintermedius, E. coli, Pseudomonas aeruginosa
and yeast Candida sp. For each etheric oil and active compound minimal inhibitory
concentrations (MIC) are observed by method of broth microdilution. Results of
these investigations have shown that active components of the EO have stronger
antimicrobial effect than complete formulation of essential oils used in the study.
Among tested EOs the most potent was the peppermint etheric oil, while carvacrol
showed the strongest antimicrobial effect among active components of EO.
Interesting finding is that there was almost no difference among MICs between
referent S. aureus and MRSA., Antimikrobna terapija je važno sredstvo u borbi protiv zaraznih bolesti. Značaj
uloge antimikrobnih sredstava u prirodi ostaje neistražen zbog prilagođavanja
patogena različitim oblicima rezistencije. Biljke proizvode sekundarne metabolite,
između ostalog i za prirodnu zaštitu od mikrobne infekcije. Cilj ovog istraživanja
bio je istražiti antimikrobne efekte 5 različitih esencijalnih ulja i 5 glavnih
sastojaka biljnih etarskih ulja na neke od uobičajenih veterinarskih mikrobnih
patogena. Biljna eterična ulja (EO) origana (Origanum vulgare L.), crnog kima
(Nigella sativa L.), sandalovine (Santalum album L.), nane (Mentha balsamea
Wild.) i eukaliptusa (Eucalyptus obliqua L'Hér.) kao i aktivnih komponenti: Dlimonen,
D-α pinen, timol, karvakrol i cinamaldehid testirani su na antimikrobnu
aktivnost protiv referentnih sojeva: Staphylococcus aureus, S. aureus rezistentne na
meticilin (MRSA), Escherichia coli kao i protiv kliničkih izolata: Staphylococcus
pseudintermedius, E. coli, Pseudomonas aeruginosa i kvasca Candida sp. Za svako
eterično ulje i aktivno jedinjenje dobijene su minimalne inhibitorne koncentracije
(MIK) mikrodilucionom metodom u bujonu. Rezultati su pokazali da aktivne
komponente EO imaju jači antimikrobni efekat od EO sa istom odgovarajućom
dominantnom komponentom. Među testiranim EO najmoćnije je bilo eterično ulje
nane, dok je karvakrol pokazao najjači antimikrobni efekat među aktivnim
komponentama EO. Zanimljiv nalaz je da gotovo nije bilo razlike među MIK
između referentne S. aureus i MRSA.",
publisher = "Institute for Animal Husbandry, Belgrade-Zemun, Serbia",
journal = "13th International Symposium: Modern trends in livestock production",
title = "Activity of some plant essential oils against common isolates in veterinary bacteriology - a pilot study, Aktivnost nekih biljnih eteričnih ulja protiv čestih izolata u veterinarskoj bakteriologiji - pilot studija",
pages = "552-560",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2311"
}
Zdravković, N., Radanović, O., Ninković, M., Savić Radovanović, R., Rajić-Savić, N., Marjanović, Đ.,& Bojkovski, J.. (2021). Activity of some plant essential oils against common isolates in veterinary bacteriology - a pilot study. in 13th International Symposium: Modern trends in livestock production
Institute for Animal Husbandry, Belgrade-Zemun, Serbia., 552-560.
https://hdl.handle.net/21.15107/rcub_veterinar_2311
Zdravković N, Radanović O, Ninković M, Savić Radovanović R, Rajić-Savić N, Marjanović Đ, Bojkovski J. Activity of some plant essential oils against common isolates in veterinary bacteriology - a pilot study. in 13th International Symposium: Modern trends in livestock production. 2021;:552-560.
https://hdl.handle.net/21.15107/rcub_veterinar_2311 .
Zdravković, Nemanja, Radanović, Oliver, Ninković, Milan, Savić Radovanović, Radoslava, Rajić-Savić, Nataša, Marjanović, Đorđe, Bojkovski, Jovan, "Activity of some plant essential oils against common isolates in veterinary bacteriology - a pilot study" in 13th International Symposium: Modern trends in livestock production (2021):552-560,
https://hdl.handle.net/21.15107/rcub_veterinar_2311 .

Characteristics of Pseudomonas spp. isolated from food of animal origin

Savić Radovanović, Radoslava; Rajić-Savić, Nataša; Gajić, Ina

(University of Belgrade, 2021)

TY  - CONF
AU  - Savić Radovanović, Radoslava
AU  - Rajić-Savić, Nataša
AU  - Gajić, Ina
PY  - 2021
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2320
AB  - Pseudomonas spp.as ubiquitous microorganism is often found in environmental raw materials as a
contaminant. P. aeruginosa and P. fluorescens but also P. putida, P. fragi and P. cochorii may be
isolated from milk and meet. From the view point of food hygiene synthesis of thermostable
lipolytic and proteolytic enzymes in the cold chain of food production, can cause the spoilage of
final product. As a causative agent of nosocomial infections, Pseudomonas spp. are often resistant
to a large number of antimicrobial substances. Due to their ubiquity and ability to acquire resistance
represents a potential risk to human health. The aims of the study were to assess antimicrobial
susceptibility of Pseudomonas spp. isolated from food and to evaluate their proteolytic and lipolytic
activity. A total of 40 isolates (20 from raw milk; 20 from carcasses of slaughtered pigs) were
examined. All of the isolates were oxidase and, catalase positive, produced a pigment on Tryptone
Soy Agar and had a characteristic odour. They also showed haemolysis on Blood agar, lipolysis on
Tributyrin and proteolysis on Casein agar. Antimicrobial susceptibility testing was performed by
disk diffusion test on piperacillin/ tazobactam, ticarcillin, imipenem, meropenem, aztreonam,
amikacin, gentamicin, levofloxacin and ceftazidime. The sensitivity of milk isolates was 100%;
65%; 100%; 100%; 25%; 75%; 30%; 65% and 100%, whereas the susceptibility of carcass-derived
isolates was 95%; 55%; 95%; 95%, 0%; 95%, 10%, 25% and 100%. Susceptibility of milk and
carcass-derived isolates to piperacillin/tazobactam, ticarcillin, imipenem, meropenem, aztreonam,
amikacin, gentamicin, levofloxacin and ceftazidime was 100%, 65%, 100%, 100%, 25%, 75%,
30%, 65%, 100% and 95%, 55%, 95%, 95%, 0%, 95%, 10%, 25%, 100%, respectively. There was
no resistance to ceftazidime indicating no ESBL strains. MDR strains resistant to three or more
antibiotics were 2 (10%) from milk and 4 (20%) from meat, namely ticarcillin, gentamicin,
levofloxacin in milk isolates and ticarcillin, gentamicin, levofloxacin in three and piperacillin /
tazobactam, ticarcillin, gentamicin, levofloxacin of one carcase isolate. In the present study, four
MDR isolates were detected, 2 (10%) being isolated from milk and 4 (20%) from meat. Their
resistance patterns were as follows: resistance to ticarcillin, gentamicin, levofloxacin (milk: n=2);
resistance to ticarcillin, gentamicin, levofloxacin (carcase: n=3), resistance to
piperacillin/tazobactam, ticarcillin, gentamicin, levofloxacin (carcase: n=1). In conclusion,
pseudomonads might contaminate raw food of animal origin consequently leading to spoilage and
considered as a reservoir of Pseudomonas spp. resistome.
PB  - University of Belgrade
C3  - 2nd International UNIfood Conference
T1  - Characteristics of Pseudomonas spp. isolated from food of animal origin
SP  - 124
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2320
ER  - 
@conference{
author = "Savić Radovanović, Radoslava and Rajić-Savić, Nataša and Gajić, Ina",
year = "2021",
abstract = "Pseudomonas spp.as ubiquitous microorganism is often found in environmental raw materials as a
contaminant. P. aeruginosa and P. fluorescens but also P. putida, P. fragi and P. cochorii may be
isolated from milk and meet. From the view point of food hygiene synthesis of thermostable
lipolytic and proteolytic enzymes in the cold chain of food production, can cause the spoilage of
final product. As a causative agent of nosocomial infections, Pseudomonas spp. are often resistant
to a large number of antimicrobial substances. Due to their ubiquity and ability to acquire resistance
represents a potential risk to human health. The aims of the study were to assess antimicrobial
susceptibility of Pseudomonas spp. isolated from food and to evaluate their proteolytic and lipolytic
activity. A total of 40 isolates (20 from raw milk; 20 from carcasses of slaughtered pigs) were
examined. All of the isolates were oxidase and, catalase positive, produced a pigment on Tryptone
Soy Agar and had a characteristic odour. They also showed haemolysis on Blood agar, lipolysis on
Tributyrin and proteolysis on Casein agar. Antimicrobial susceptibility testing was performed by
disk diffusion test on piperacillin/ tazobactam, ticarcillin, imipenem, meropenem, aztreonam,
amikacin, gentamicin, levofloxacin and ceftazidime. The sensitivity of milk isolates was 100%;
65%; 100%; 100%; 25%; 75%; 30%; 65% and 100%, whereas the susceptibility of carcass-derived
isolates was 95%; 55%; 95%; 95%, 0%; 95%, 10%, 25% and 100%. Susceptibility of milk and
carcass-derived isolates to piperacillin/tazobactam, ticarcillin, imipenem, meropenem, aztreonam,
amikacin, gentamicin, levofloxacin and ceftazidime was 100%, 65%, 100%, 100%, 25%, 75%,
30%, 65%, 100% and 95%, 55%, 95%, 95%, 0%, 95%, 10%, 25%, 100%, respectively. There was
no resistance to ceftazidime indicating no ESBL strains. MDR strains resistant to three or more
antibiotics were 2 (10%) from milk and 4 (20%) from meat, namely ticarcillin, gentamicin,
levofloxacin in milk isolates and ticarcillin, gentamicin, levofloxacin in three and piperacillin /
tazobactam, ticarcillin, gentamicin, levofloxacin of one carcase isolate. In the present study, four
MDR isolates were detected, 2 (10%) being isolated from milk and 4 (20%) from meat. Their
resistance patterns were as follows: resistance to ticarcillin, gentamicin, levofloxacin (milk: n=2);
resistance to ticarcillin, gentamicin, levofloxacin (carcase: n=3), resistance to
piperacillin/tazobactam, ticarcillin, gentamicin, levofloxacin (carcase: n=1). In conclusion,
pseudomonads might contaminate raw food of animal origin consequently leading to spoilage and
considered as a reservoir of Pseudomonas spp. resistome.",
publisher = "University of Belgrade",
journal = "2nd International UNIfood Conference",
title = "Characteristics of Pseudomonas spp. isolated from food of animal origin",
pages = "124",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2320"
}
Savić Radovanović, R., Rajić-Savić, N.,& Gajić, I.. (2021). Characteristics of Pseudomonas spp. isolated from food of animal origin. in 2nd International UNIfood Conference
University of Belgrade., 124.
https://hdl.handle.net/21.15107/rcub_veterinar_2320
Savić Radovanović R, Rajić-Savić N, Gajić I. Characteristics of Pseudomonas spp. isolated from food of animal origin. in 2nd International UNIfood Conference. 2021;:124.
https://hdl.handle.net/21.15107/rcub_veterinar_2320 .
Savić Radovanović, Radoslava, Rajić-Savić, Nataša, Gajić, Ina, "Characteristics of Pseudomonas spp. isolated from food of animal origin" in 2nd International UNIfood Conference (2021):124,
https://hdl.handle.net/21.15107/rcub_veterinar_2320 .

Karakteristike izolata Pseudomonas spp. iz hrane životinjskog porekla

Savić Radovanović, Radoslava; Rajić-Savić, Nataša; Karabasil, Nedjeljko

(Srpsko veterinarsko društvo, Beograd, 2020)

TY  - CONF
AU  - Savić Radovanović, Radoslava
AU  - Rajić-Savić, Nataša
AU  - Karabasil, Nedjeljko
PY  - 2020
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2315
AB  - Pсеудомонaс спп. се као убиквитарни микроорганизам налази у спољашњој средини и сировом материјалу као контаминент. Из млека и меса су најчешће изоловани P.aеруgиносa и P.флуоресценс, али и P.путидa, P.фрagи, P.цоцхории и P.јенсен. Значај са аспекта хигијене хране се огледа у способности Pсеудомонaс спп. да синтетише термостабилне липолитичке и протеолитичке ензиме, који у хладном ланцу производње хране, могу да доведу до квара финалног производа. Као узрочник интрахоспиталних инфекција Pсеудомонaс спп. су често отпорни на велики број антимикробних лекова. Циљ овог рада је био да се испита антимикробна осетљивост изолата Pсеудомонaс спп. из хране и да се испита њихова протеолитичка и липолитичка активност. Испитано је укупно је по 20 изолата из сировог млека и 20 изолата са површине трупова закланих свиња. Сви изолати су били оксидаза и, каталаза позитивни, стварали су зелени пигмент на Триптон соја агару и имали су карактеристичан мирис. Такође, показивали су хемолизу на крвном, липолизу на трибутирин и протеолизу на агару са казеином. За испитивање антимикробне осетљивости коришћена је диск дифузиона метода за антибиотике пиперaциллин/тaзоbaцтaм, тикaрцилин, имипенем, меропенем, aзтреонaм, aмикaцин, gентaмицин, леvофлоксaцин и цефтaзидим. Осетљивост код изолата пореклом из млека је била 100%; 65%;100%;100%; 25%;75%; 30%; 65% и 100%, док је осетљивост изолата пореклом са трупова била 95%; 55%; 95%; 95%, 0%; 95%, 10%, 25% и 100%. Ни код једног изолата није доказана отпорност на цефтазидим што указује да није било ESBL сојева. MDR сојева отпорних на три или више антибиотика је било 2 (10%) из млека и 4 (20%) из меса, и то на тикарцилин, гентамицин, левофлоксацин код изолата из млека и тикарцилин, гентамицин, левофлоксацин код три и пиперацилин/тазобактам, тикарцилин, гентамицин, левофлоксацин једног изолата са трупова. Добијени резултати показују да псеудомонас може да контаминира храну животињског порекла и да проузрокује квар, али може да се разматра као извор гена резистенције.
AB  - Pseudomonas spp. as ubiquitous microorganism is often found in environmental, raw materials as a contaminant. P.aeruginosa and P.fluorescens but also P.putida, P.fragi and P.cochorii may be isolated from milk and meet. From the view point of food hygiene, synthesis of termostable lipolytic and proteolytic enzymes in the cold chain of food processing, can cause the spoilage of final product. As a causative agent of nosocomial infections, Pseudomonas spp. are often resistant to a large number of antimicrobial substances. The aim of this study was to assess antimicrobial susceptibility of Pseudomonas spp. isolated from food and to evaluate their proteolytic and lipolytic activity. A total of 40 isolates (20 from raw milk; 20 from carcasses of slaughtered pigs) were examined. All of the isolates were oxidase and, catalase positive, produced a pigment on Tryptone Soy Agar and had a characteristic odor. They also showed hemolysis on Blood agar, lipolysis on Tributyrin and proteolysis on Casein agar. Antimicrobial susceptibility testing was performed by disk diffusion test for piperacillin/ tazobactam, ticarcillin, imipenem, meropenem, aztreonam, amikacin, gentamicin, levofloxacin and ceftazidime. The sensitivity of milk isolates was 100%; 65%; 100%; 100%; 25%; 75%; 30%; 65% and 100%, whereas the susceptibility of carcass-derived isolates was 95%; 55%; 95%; 95%, 0%; 95%, 10%, 25% and 100%. Susceptibility of milk and carcass-derived isolates to piperacillin/tazobactam, ticarcillin, imipenem, meropenem, aztreonam, amikacin, gentamicin, levofloxacin and ceftazidimewas 100%, 65%, 100%, 100%, 25%, 75%, 30%, 65%, 100% and 95%, 55%, 95%, 95%, 0%, 95%, 10%, 25%, 100%, respectively.There was no resistance to ceftazidime indicating no ESBL strains. MDR strains resistant to three or more antibiotics were 2 (10%) from milk and 4 (20%) from meat, namely ticarcillin, gentamicin, levofloxacin in milk isolates and ticarcillin, gentamicin, levofloxacin in three and piperacillin / tazobactam, ticarcillin, gentamicin, levofloxacin of one carcase isolate.In the present study, four MDR isolates were detected, 2 (10%) being isolated from milk and 4 (20%) from meat. Their resistance patterns were as follows: resistance to ticarcillin, gentamicin, levofloxacin (milk: n=2); resistance to ticarcillin, gentamicin, levofloxacin (carcasse: n=3), resistance to piperacillin/tazobactam, ticarcillin, gentamicin, levofloxacin (carcasse:n=1). In conclusion, psesudomonads might contaminate raw food of animal origin consequently leading to spoilage and considered as a reservoir of Pseudomonas spp. resistome.
PB  - Srpsko veterinarsko društvo, Beograd
C3  - 31. Savetovanje Veterinara Srbije
T1  - Karakteristike izolata Pseudomonas spp. iz hrane životinjskog porekla
SP  - 225
EP  - 226
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2315
ER  - 
@conference{
author = "Savić Radovanović, Radoslava and Rajić-Savić, Nataša and Karabasil, Nedjeljko",
year = "2020",
abstract = "Pсеудомонaс спп. се као убиквитарни микроорганизам налази у спољашњој средини и сировом материјалу као контаминент. Из млека и меса су најчешће изоловани P.aеруgиносa и P.флуоресценс, али и P.путидa, P.фрagи, P.цоцхории и P.јенсен. Значај са аспекта хигијене хране се огледа у способности Pсеудомонaс спп. да синтетише термостабилне липолитичке и протеолитичке ензиме, који у хладном ланцу производње хране, могу да доведу до квара финалног производа. Као узрочник интрахоспиталних инфекција Pсеудомонaс спп. су често отпорни на велики број антимикробних лекова. Циљ овог рада је био да се испита антимикробна осетљивост изолата Pсеудомонaс спп. из хране и да се испита њихова протеолитичка и липолитичка активност. Испитано је укупно је по 20 изолата из сировог млека и 20 изолата са површине трупова закланих свиња. Сви изолати су били оксидаза и, каталаза позитивни, стварали су зелени пигмент на Триптон соја агару и имали су карактеристичан мирис. Такође, показивали су хемолизу на крвном, липолизу на трибутирин и протеолизу на агару са казеином. За испитивање антимикробне осетљивости коришћена је диск дифузиона метода за антибиотике пиперaциллин/тaзоbaцтaм, тикaрцилин, имипенем, меропенем, aзтреонaм, aмикaцин, gентaмицин, леvофлоксaцин и цефтaзидим. Осетљивост код изолата пореклом из млека је била 100%; 65%;100%;100%; 25%;75%; 30%; 65% и 100%, док је осетљивост изолата пореклом са трупова била 95%; 55%; 95%; 95%, 0%; 95%, 10%, 25% и 100%. Ни код једног изолата није доказана отпорност на цефтазидим што указује да није било ESBL сојева. MDR сојева отпорних на три или више антибиотика је било 2 (10%) из млека и 4 (20%) из меса, и то на тикарцилин, гентамицин, левофлоксацин код изолата из млека и тикарцилин, гентамицин, левофлоксацин код три и пиперацилин/тазобактам, тикарцилин, гентамицин, левофлоксацин једног изолата са трупова. Добијени резултати показују да псеудомонас може да контаминира храну животињског порекла и да проузрокује квар, али може да се разматра као извор гена резистенције., Pseudomonas spp. as ubiquitous microorganism is often found in environmental, raw materials as a contaminant. P.aeruginosa and P.fluorescens but also P.putida, P.fragi and P.cochorii may be isolated from milk and meet. From the view point of food hygiene, synthesis of termostable lipolytic and proteolytic enzymes in the cold chain of food processing, can cause the spoilage of final product. As a causative agent of nosocomial infections, Pseudomonas spp. are often resistant to a large number of antimicrobial substances. The aim of this study was to assess antimicrobial susceptibility of Pseudomonas spp. isolated from food and to evaluate their proteolytic and lipolytic activity. A total of 40 isolates (20 from raw milk; 20 from carcasses of slaughtered pigs) were examined. All of the isolates were oxidase and, catalase positive, produced a pigment on Tryptone Soy Agar and had a characteristic odor. They also showed hemolysis on Blood agar, lipolysis on Tributyrin and proteolysis on Casein agar. Antimicrobial susceptibility testing was performed by disk diffusion test for piperacillin/ tazobactam, ticarcillin, imipenem, meropenem, aztreonam, amikacin, gentamicin, levofloxacin and ceftazidime. The sensitivity of milk isolates was 100%; 65%; 100%; 100%; 25%; 75%; 30%; 65% and 100%, whereas the susceptibility of carcass-derived isolates was 95%; 55%; 95%; 95%, 0%; 95%, 10%, 25% and 100%. Susceptibility of milk and carcass-derived isolates to piperacillin/tazobactam, ticarcillin, imipenem, meropenem, aztreonam, amikacin, gentamicin, levofloxacin and ceftazidimewas 100%, 65%, 100%, 100%, 25%, 75%, 30%, 65%, 100% and 95%, 55%, 95%, 95%, 0%, 95%, 10%, 25%, 100%, respectively.There was no resistance to ceftazidime indicating no ESBL strains. MDR strains resistant to three or more antibiotics were 2 (10%) from milk and 4 (20%) from meat, namely ticarcillin, gentamicin, levofloxacin in milk isolates and ticarcillin, gentamicin, levofloxacin in three and piperacillin / tazobactam, ticarcillin, gentamicin, levofloxacin of one carcase isolate.In the present study, four MDR isolates were detected, 2 (10%) being isolated from milk and 4 (20%) from meat. Their resistance patterns were as follows: resistance to ticarcillin, gentamicin, levofloxacin (milk: n=2); resistance to ticarcillin, gentamicin, levofloxacin (carcasse: n=3), resistance to piperacillin/tazobactam, ticarcillin, gentamicin, levofloxacin (carcasse:n=1). In conclusion, psesudomonads might contaminate raw food of animal origin consequently leading to spoilage and considered as a reservoir of Pseudomonas spp. resistome.",
publisher = "Srpsko veterinarsko društvo, Beograd",
journal = "31. Savetovanje Veterinara Srbije",
title = "Karakteristike izolata Pseudomonas spp. iz hrane životinjskog porekla",
pages = "225-226",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2315"
}
Savić Radovanović, R., Rajić-Savić, N.,& Karabasil, N.. (2020). Karakteristike izolata Pseudomonas spp. iz hrane životinjskog porekla. in 31. Savetovanje Veterinara Srbije
Srpsko veterinarsko društvo, Beograd., 225-226.
https://hdl.handle.net/21.15107/rcub_veterinar_2315
Savić Radovanović R, Rajić-Savić N, Karabasil N. Karakteristike izolata Pseudomonas spp. iz hrane životinjskog porekla. in 31. Savetovanje Veterinara Srbije. 2020;:225-226.
https://hdl.handle.net/21.15107/rcub_veterinar_2315 .
Savić Radovanović, Radoslava, Rajić-Savić, Nataša, Karabasil, Nedjeljko, "Karakteristike izolata Pseudomonas spp. iz hrane životinjskog porekla" in 31. Savetovanje Veterinara Srbije (2020):225-226,
https://hdl.handle.net/21.15107/rcub_veterinar_2315 .

Biofilm Production and Antimicrobial Resistance of Clinical and Food Isolates of Pseudomonas spp.

Savić Radovanović, Radoslava; Rajić Savić, Nataša; Ranin, Lazar; Smitran, Aleksandra; Vučković Opavski, Nataša; Milosavljević Tepavčević, Andreja; Ranin, Jovana; Gajić, Ina

(Springer, 2020)

TY  - JOUR
AU  - Savić Radovanović, Radoslava
AU  - Rajić Savić, Nataša
AU  - Ranin, Lazar
AU  - Smitran, Aleksandra
AU  - Vučković Opavski, Nataša
AU  - Milosavljević Tepavčević, Andreja
AU  - Ranin, Jovana
AU  - Gajić, Ina
PY  - 2020
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2697
AB  - Due to its ubiquity, ability to form biofilms, and acquire resistance mechanisms, Pseudomonas spp. become one of the major
challenge for healthcare settings and food industry. The aims of this study were to assess the biofilm production of Pseudomonas
spp. recovered from clinical and food specimens and to evaluate their antimicrobial resistance. A total of 108
isolates of Pseudomonas spp. were included in the study, 48 being clinical isolates recovered from patients admitted to four
tertiary care hospitals throughout Serbia and 60 were isolated from the bulk tank milk samples and meat carcasses. Biofilm
production was analyzed by microtiter plate assay. Antimicrobial susceptibility was evaluated by disk diffusion method
according to the CLSI guidelines, while class A and B β-lactamases encoding genes were screened by PCR. A total of 98
(90.7%) strains were biofilm producers (moderate producer: 68, 69.4%; strong producer: 8, 8.2%). Although a slightly higher
percentage of clinical isolates were biofilm producers (91.7%) compared to food isolates (90%), statistical significance was
not observed (P > 0.05). The proportion of carbapenem-resistant Pseudomonas aeruginosa (CRPA) isolates was significantly
higher among clinical (42%) isolates compared to food (1.7%) Pseudomonads (P < 0.05). The blaPER and blaNDM genes were
found in ESBL (seven isolates) and MBL (two isolates) production, respectively. In the present study, we confirmed that
biofilm formation was highly present in both clinical and food Pseudomonas spp. irrespective of the prior existence of resistance
genes. Additionally, clinical settings pose a major reservoir of MDR Pseudomonas spp. and especially CRPA isolates.
PB  - Springer
T2  - Current Microbiology
T1  - Biofilm Production and Antimicrobial Resistance of Clinical and Food Isolates of Pseudomonas spp.
VL  - 77
SP  - 4045
EP  - 4052
DO  - 10.1007/s00284-020-02236-4
ER  - 
@article{
author = "Savić Radovanović, Radoslava and Rajić Savić, Nataša and Ranin, Lazar and Smitran, Aleksandra and Vučković Opavski, Nataša and Milosavljević Tepavčević, Andreja and Ranin, Jovana and Gajić, Ina",
year = "2020",
abstract = "Due to its ubiquity, ability to form biofilms, and acquire resistance mechanisms, Pseudomonas spp. become one of the major
challenge for healthcare settings and food industry. The aims of this study were to assess the biofilm production of Pseudomonas
spp. recovered from clinical and food specimens and to evaluate their antimicrobial resistance. A total of 108
isolates of Pseudomonas spp. were included in the study, 48 being clinical isolates recovered from patients admitted to four
tertiary care hospitals throughout Serbia and 60 were isolated from the bulk tank milk samples and meat carcasses. Biofilm
production was analyzed by microtiter plate assay. Antimicrobial susceptibility was evaluated by disk diffusion method
according to the CLSI guidelines, while class A and B β-lactamases encoding genes were screened by PCR. A total of 98
(90.7%) strains were biofilm producers (moderate producer: 68, 69.4%; strong producer: 8, 8.2%). Although a slightly higher
percentage of clinical isolates were biofilm producers (91.7%) compared to food isolates (90%), statistical significance was
not observed (P > 0.05). The proportion of carbapenem-resistant Pseudomonas aeruginosa (CRPA) isolates was significantly
higher among clinical (42%) isolates compared to food (1.7%) Pseudomonads (P < 0.05). The blaPER and blaNDM genes were
found in ESBL (seven isolates) and MBL (two isolates) production, respectively. In the present study, we confirmed that
biofilm formation was highly present in both clinical and food Pseudomonas spp. irrespective of the prior existence of resistance
genes. Additionally, clinical settings pose a major reservoir of MDR Pseudomonas spp. and especially CRPA isolates.",
publisher = "Springer",
journal = "Current Microbiology",
title = "Biofilm Production and Antimicrobial Resistance of Clinical and Food Isolates of Pseudomonas spp.",
volume = "77",
pages = "4045-4052",
doi = "10.1007/s00284-020-02236-4"
}
Savić Radovanović, R., Rajić Savić, N., Ranin, L., Smitran, A., Vučković Opavski, N., Milosavljević Tepavčević, A., Ranin, J.,& Gajić, I.. (2020). Biofilm Production and Antimicrobial Resistance of Clinical and Food Isolates of Pseudomonas spp.. in Current Microbiology
Springer., 77, 4045-4052.
https://doi.org/10.1007/s00284-020-02236-4
Savić Radovanović R, Rajić Savić N, Ranin L, Smitran A, Vučković Opavski N, Milosavljević Tepavčević A, Ranin J, Gajić I. Biofilm Production and Antimicrobial Resistance of Clinical and Food Isolates of Pseudomonas spp.. in Current Microbiology. 2020;77:4045-4052.
doi:10.1007/s00284-020-02236-4 .
Savić Radovanović, Radoslava, Rajić Savić, Nataša, Ranin, Lazar, Smitran, Aleksandra, Vučković Opavski, Nataša, Milosavljević Tepavčević, Andreja, Ranin, Jovana, Gajić, Ina, "Biofilm Production and Antimicrobial Resistance of Clinical and Food Isolates of Pseudomonas spp." in Current Microbiology, 77 (2020):4045-4052,
https://doi.org/10.1007/s00284-020-02236-4 . .
11

Mikroorganizmi kvara hrane

Savić Radovanović, Radoslava; Vuković, Dejan; Kureljušić, Jasna; Rajić-Savić, Nataša

(Ветеринарска комора Републике Српске, 2020)

TY  - CONF
AU  - Savić Radovanović, Radoslava
AU  - Vuković, Dejan
AU  - Kureljušić, Jasna
AU  - Rajić-Savić, Nataša
PY  - 2020
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2325
AB  - Производња хране представља значајну привредну делатност и улогу у
снабдевању становништва животним намирницама, док квар хране има за
последицу велике економске губитке услед одбацивања хране као
неупотребљиве за исхрану и трошкова уклањања органског отпада. Према
новијим истраживањима 30% произведене хране заврши на светским
депонијама, где подлеже трулежним процесима и распадању, при чему се
ослобађају гасови, међу којима и метан. Према дефиницији квар хране
представља различите процесе, који узрокују да храна буде непожељна или
неприхватљива за људску употребу због промене сензорних карактеристика.
Квар хране се може дефинисати и као "свака сензорна промена (тактилна,
визуелна, олфактивна или промена укуса)" коју конзумент сматра да је
неприхватљива. Квар може настати у било којој фази ланца хране. Све врсте
квара се могу сврстати у следеће групе: биохемијски (ензимски),
микробиолошки, хемијски и технолошки квар. Микробиолошки квар хране
може бити проузрокован узрочницима као што су бактерије, квасци и плесни.
Хемијски квар подразумева промене проузроковане хемијским и физичко-
хемијским реакцијама који настају услед штетног утицаја фактора спољне
средине (високе температуре, ваздух, влага, светлост, pH итд). Често је тешко
утврдити да ли се ради о искључиво хемијском, биохемијском или
микробиолошком квару, јер се промене одвијају паралелно. Под појмом
„технолошки квар“ подразумева се у ширем смислу квар проузрокован
грешкама током технолошког процеса добијања хране. Према подацима
истраживања, које је спровео Центар за унапређење животне средине
2019.године, у Републици Србији је одбачено 247.000 t хране, што на дневном
нивоу износи 676 t, и може се прерачунати да један становник у току године
дневно баци 35 kg хране. Од хране се највише баца хлеб (10,18 kg), месо (7,18
kg) и млеко (6,74 l), а знатно мање храна биљног порекла - воће (5,7 kg ) и
поврће (5,33 kg). Kao разлог због којег се храна баца на првом месту се наводи
квар (67%), затим одбијање конзумената да једу храну, која није свежа (17%) и
мишљење потрошача да храна није безбедна (11%). Један од највећих изазоваза савремену индустрију хране јесте како сачувати намирнице од квара. Због
свог хемијског састава храна, посебно храна животињског порекла (млеко и
производи од млека; месо и производи од меса) представља добру средину за
раст и размножавање микроорганизама, стога је за циљ овог рада постављено
да се укаже на значај микроорганизама, који могу да доведу до квара хране. У
раду ће бити описане врсте микроорганизама, њихове карактеристике и
промене које доводе у храни животињског порекла.
AB  - Food production represents a significant economic activity and has a role in
supplying the population with food, while food spoilage results in large economic
losses due to the rejection of food as unusable and the costs of disposing of organic
waste. According to recent study, 30% of produced food ends up in the world's
landfills, where undergoes putrefaction and decomposition, releasing gases,
including methane. Food spoilage is defined as various processes, which cause
food to be undesirable or unacceptable for human use due to a changes in sensory
characteristics. Food spolage can also be defined as "any sensory change (tactile,
visual, olfactory or aroma change)" that the consumer considers unacceptable.
Spoilage can occur at any stage along food chain. All types of spoilage can be
classified into the following groups: biochemical (enzymatic), microbiological,
chemical and technological spoilage. Microbiological spoilage of food can be
caused by pathogens such as bacteria, yeasts and molds. Chemical spoilage means
changes caused by chemical and physico-chemical reactions that occur due to the
harmful influence of environmental factors (high temperatures, atmosphere,
humidity, light, pH, etc.). It is often difficult to determine whether it is a strict
chemical, biochemical or microbiological spoilage, because the changes take place
in parallel. The term "technological spoilage" means in a broader sense a spoilage
caused by mistakes during the technological process in food production.
According to the research conducted by the Center for Environmental
Improvement in 2019 in the Republic of Serbia, 247,000 tons of food were
discarded, of which is 676 tons on a daily basis, and it can be calculated that one
inhabitant throws 35 kg of food per year. Bread (10.18 kg), meat (7.18 kg) and milk
(6.74 l) are the most discarded food, while much less food of plant origin - fruits
(5.7 kg) and vegetables (5.33 kg). The reason for discarding the food in the first
place is the spoilage (67%), then the refusal of consumers to eat the food, which is
not fresh (17%) and the opinion of consumers that the food is not safe (11%). One
of the biggest challenges for the modern food industry is how to save food from
spoilage. Due to its chemical composition, food, especially food of animal origin (milk and dairy products; meat and meat products) is a good environment for the
growth and muliplication of microorganisms, so the aim of this paper is to point
out the importance of microorganisms that can cause food spoilage. The paper will
describe the types of microorganisms, their characteristics and the changes they
cause in food of animal origin.
PB  - Ветеринарска комора Републике Српске
C3  - 25. Godišnje Savetovanje doktora veterinarske medicine Republike Srpske
T1  - Mikroorganizmi kvara hrane
T1  - Spoilage microorganisms in food
SP  - 110
EP  - 113
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2325
ER  - 
@conference{
author = "Savić Radovanović, Radoslava and Vuković, Dejan and Kureljušić, Jasna and Rajić-Savić, Nataša",
year = "2020",
abstract = "Производња хране представља значајну привредну делатност и улогу у
снабдевању становништва животним намирницама, док квар хране има за
последицу велике економске губитке услед одбацивања хране као
неупотребљиве за исхрану и трошкова уклањања органског отпада. Према
новијим истраживањима 30% произведене хране заврши на светским
депонијама, где подлеже трулежним процесима и распадању, при чему се
ослобађају гасови, међу којима и метан. Према дефиницији квар хране
представља различите процесе, који узрокују да храна буде непожељна или
неприхватљива за људску употребу због промене сензорних карактеристика.
Квар хране се може дефинисати и као "свака сензорна промена (тактилна,
визуелна, олфактивна или промена укуса)" коју конзумент сматра да је
неприхватљива. Квар може настати у било којој фази ланца хране. Све врсте
квара се могу сврстати у следеће групе: биохемијски (ензимски),
микробиолошки, хемијски и технолошки квар. Микробиолошки квар хране
може бити проузрокован узрочницима као што су бактерије, квасци и плесни.
Хемијски квар подразумева промене проузроковане хемијским и физичко-
хемијским реакцијама који настају услед штетног утицаја фактора спољне
средине (високе температуре, ваздух, влага, светлост, pH итд). Често је тешко
утврдити да ли се ради о искључиво хемијском, биохемијском или
микробиолошком квару, јер се промене одвијају паралелно. Под појмом
„технолошки квар“ подразумева се у ширем смислу квар проузрокован
грешкама током технолошког процеса добијања хране. Према подацима
истраживања, које је спровео Центар за унапређење животне средине
2019.године, у Републици Србији је одбачено 247.000 t хране, што на дневном
нивоу износи 676 t, и може се прерачунати да један становник у току године
дневно баци 35 kg хране. Од хране се највише баца хлеб (10,18 kg), месо (7,18
kg) и млеко (6,74 l), а знатно мање храна биљног порекла - воће (5,7 kg ) и
поврће (5,33 kg). Kao разлог због којег се храна баца на првом месту се наводи
квар (67%), затим одбијање конзумената да једу храну, која није свежа (17%) и
мишљење потрошача да храна није безбедна (11%). Један од највећих изазоваза савремену индустрију хране јесте како сачувати намирнице од квара. Због
свог хемијског састава храна, посебно храна животињског порекла (млеко и
производи од млека; месо и производи од меса) представља добру средину за
раст и размножавање микроорганизама, стога је за циљ овог рада постављено
да се укаже на значај микроорганизама, који могу да доведу до квара хране. У
раду ће бити описане врсте микроорганизама, њихове карактеристике и
промене које доводе у храни животињског порекла., Food production represents a significant economic activity and has a role in
supplying the population with food, while food spoilage results in large economic
losses due to the rejection of food as unusable and the costs of disposing of organic
waste. According to recent study, 30% of produced food ends up in the world's
landfills, where undergoes putrefaction and decomposition, releasing gases,
including methane. Food spoilage is defined as various processes, which cause
food to be undesirable or unacceptable for human use due to a changes in sensory
characteristics. Food spolage can also be defined as "any sensory change (tactile,
visual, olfactory or aroma change)" that the consumer considers unacceptable.
Spoilage can occur at any stage along food chain. All types of spoilage can be
classified into the following groups: biochemical (enzymatic), microbiological,
chemical and technological spoilage. Microbiological spoilage of food can be
caused by pathogens such as bacteria, yeasts and molds. Chemical spoilage means
changes caused by chemical and physico-chemical reactions that occur due to the
harmful influence of environmental factors (high temperatures, atmosphere,
humidity, light, pH, etc.). It is often difficult to determine whether it is a strict
chemical, biochemical or microbiological spoilage, because the changes take place
in parallel. The term "technological spoilage" means in a broader sense a spoilage
caused by mistakes during the technological process in food production.
According to the research conducted by the Center for Environmental
Improvement in 2019 in the Republic of Serbia, 247,000 tons of food were
discarded, of which is 676 tons on a daily basis, and it can be calculated that one
inhabitant throws 35 kg of food per year. Bread (10.18 kg), meat (7.18 kg) and milk
(6.74 l) are the most discarded food, while much less food of plant origin - fruits
(5.7 kg) and vegetables (5.33 kg). The reason for discarding the food in the first
place is the spoilage (67%), then the refusal of consumers to eat the food, which is
not fresh (17%) and the opinion of consumers that the food is not safe (11%). One
of the biggest challenges for the modern food industry is how to save food from
spoilage. Due to its chemical composition, food, especially food of animal origin (milk and dairy products; meat and meat products) is a good environment for the
growth and muliplication of microorganisms, so the aim of this paper is to point
out the importance of microorganisms that can cause food spoilage. The paper will
describe the types of microorganisms, their characteristics and the changes they
cause in food of animal origin.",
publisher = "Ветеринарска комора Републике Српске",
journal = "25. Godišnje Savetovanje doktora veterinarske medicine Republike Srpske",
title = "Mikroorganizmi kvara hrane, Spoilage microorganisms in food",
pages = "110-113",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2325"
}
Savić Radovanović, R., Vuković, D., Kureljušić, J.,& Rajić-Savić, N.. (2020). Mikroorganizmi kvara hrane. in 25. Godišnje Savetovanje doktora veterinarske medicine Republike Srpske
Ветеринарска комора Републике Српске., 110-113.
https://hdl.handle.net/21.15107/rcub_veterinar_2325
Savić Radovanović R, Vuković D, Kureljušić J, Rajić-Savić N. Mikroorganizmi kvara hrane. in 25. Godišnje Savetovanje doktora veterinarske medicine Republike Srpske. 2020;:110-113.
https://hdl.handle.net/21.15107/rcub_veterinar_2325 .
Savić Radovanović, Radoslava, Vuković, Dejan, Kureljušić, Jasna, Rajić-Savić, Nataša, "Mikroorganizmi kvara hrane" in 25. Godišnje Savetovanje doktora veterinarske medicine Republike Srpske (2020):110-113,
https://hdl.handle.net/21.15107/rcub_veterinar_2325 .

Occurrence of biofilm forming coagulasepositive isolates in case of subclinical mastitis

Rajić-Savić, Nataša; Furdek, Aleksandar; Savić Radovanović, Radoslava

(Udruženje mikrobiologa Srbije, Beograd, 2020)

TY  - CONF
AU  - Rajić-Savić, Nataša
AU  - Furdek, Aleksandar
AU  - Savić Radovanović, Radoslava
PY  - 2020
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2313
AB  - Coagulasepositive
staphylococci (CPS) are the leading health and economic problem in primary milk production. Some
strains are cappable to form a biofilm causing presistent intramammary infestions, easily spreading to the udder of
healthy cows and contaminateing the environment. By excretion into milk, they can enter the food chain and pose a
risk to human health. Determination of the ability to form a biofilm during isolation and identification of CPS in short
period of time could improve good veterinary practice. The aim of this work was to determine the ability to form biofim
in CPS isolates from cows mastitic milk. From 56 quarter milk samples with > 500.000 cells/mL, CPS were isolated from
29 (51.78%) samples.
The abilty of CPS to form biofilm was examined by Congo Red Agar (CRA) method and Crystal Violet assay. Based on the
colour and consistensy of the colonies at CRA, it was detected that out of 29 CPS isolates 5 (17.24%) isolates produced
slime, 16 (55.17%) were suspected producers and 8 (27.5%) isolates did not produce the slime. Estimation of biofilm
production by microtiter plate method was performed mesering the optical density at 630 nm (OD630) and showed
that 8 (27.5%) isolates were high producers, 12 (34.8%) moderate, 6 (20.60%) weak and 3 (10.30%) isolates did not
produced biofilm. It can be concluded that Congo red agar method may be used as a rapid method for detection of
biofilm producing CPS isolates.
PB  - Udruženje mikrobiologa Srbije, Beograd
C3  - FEMS Online Conference on Microbiology
T1  - Occurrence of biofilm forming coagulasepositive isolates in case of subclinical mastitis
SP  - 197
UR  - https://hdl.handle.net/21.15107/rcub_veterinar_2313
ER  - 
@conference{
author = "Rajić-Savić, Nataša and Furdek, Aleksandar and Savić Radovanović, Radoslava",
year = "2020",
abstract = "Coagulasepositive
staphylococci (CPS) are the leading health and economic problem in primary milk production. Some
strains are cappable to form a biofilm causing presistent intramammary infestions, easily spreading to the udder of
healthy cows and contaminateing the environment. By excretion into milk, they can enter the food chain and pose a
risk to human health. Determination of the ability to form a biofilm during isolation and identification of CPS in short
period of time could improve good veterinary practice. The aim of this work was to determine the ability to form biofim
in CPS isolates from cows mastitic milk. From 56 quarter milk samples with > 500.000 cells/mL, CPS were isolated from
29 (51.78%) samples.
The abilty of CPS to form biofilm was examined by Congo Red Agar (CRA) method and Crystal Violet assay. Based on the
colour and consistensy of the colonies at CRA, it was detected that out of 29 CPS isolates 5 (17.24%) isolates produced
slime, 16 (55.17%) were suspected producers and 8 (27.5%) isolates did not produce the slime. Estimation of biofilm
production by microtiter plate method was performed mesering the optical density at 630 nm (OD630) and showed
that 8 (27.5%) isolates were high producers, 12 (34.8%) moderate, 6 (20.60%) weak and 3 (10.30%) isolates did not
produced biofilm. It can be concluded that Congo red agar method may be used as a rapid method for detection of
biofilm producing CPS isolates.",
publisher = "Udruženje mikrobiologa Srbije, Beograd",
journal = "FEMS Online Conference on Microbiology",
title = "Occurrence of biofilm forming coagulasepositive isolates in case of subclinical mastitis",
pages = "197",
url = "https://hdl.handle.net/21.15107/rcub_veterinar_2313"
}
Rajić-Savić, N., Furdek, A.,& Savić Radovanović, R.. (2020). Occurrence of biofilm forming coagulasepositive isolates in case of subclinical mastitis. in FEMS Online Conference on Microbiology
Udruženje mikrobiologa Srbije, Beograd., 197.
https://hdl.handle.net/21.15107/rcub_veterinar_2313
Rajić-Savić N, Furdek A, Savić Radovanović R. Occurrence of biofilm forming coagulasepositive isolates in case of subclinical mastitis. in FEMS Online Conference on Microbiology. 2020;:197.
https://hdl.handle.net/21.15107/rcub_veterinar_2313 .
Rajić-Savić, Nataša, Furdek, Aleksandar, Savić Radovanović, Radoslava, "Occurrence of biofilm forming coagulasepositive isolates in case of subclinical mastitis" in FEMS Online Conference on Microbiology (2020):197,
https://hdl.handle.net/21.15107/rcub_veterinar_2313 .

Finding of coagulase negative staphylococci in the herd with an increased number of somatic cells in milk and their antimicrobial susceptibility

Katić, Vera; Rajić-Savić, Nataša

(Vakultet veterinarske medicine, Beograd, Srbija, 2013)

TY  - JOUR
AU  - Katić, Vera
AU  - Rajić-Savić, Nataša
PY  - 2013
UR  - https://vet-erinar.vet.bg.ac.rs/handle/123456789/1918
AB  - Coagulase-negative staphylococci (CNS) are generally considered to be opportunistic pathogens. Controlling CNS mastitis is difficult because the epidemiology is not clear, and the CNS group consists of about 40 different Staphylococcus species. Therefore, the aim of this study was to determine the prevalence of coagulasenegative staphylococci in milk of the cows with subclinical mastitis, as well as to determine different CNS species isolated from quarter milk samples for their susceptibility to antimicrobials used commonly for mastitis therapy. On the farm where there was found an increase of somatic cells in bulk milk, 112 dairy cows were examined by mastitis test. From 52 udder quarters where mastitis test showed an increase of somatic cells, milk samples were taken for bacteriological examination. For isolating the causes of mastitis there was used blood agar. Identification of the causative agents of mastitis was carried out on the basis of colony appearance on blood agar and their physiological characteristics. Coagulasepositive staphylococci sensitivity which cause mastitis was tested by Kirby Bauer method. For susceptibility testing there were used commercially produced discs containing: 10 IU penicillin, amoxicillin/clavulanic acid (20 +10  g), cloxacillin 25  g, 30  g amoxicillin, cephalexin 30  g, ceftiofur 30  g, 15  g lincomycin, gentamicin and tetracycline 30  g. The sensitivity of microorganisms was evaluated on the basis of inhibition zone diameter recommended by the manufacturer and was labeled as sensitive (S) moderately sensitive (I) or resistant (R).  Coagulase-negative staphylococci were isolated from 61.53% of samples from cows with subclinical mastitis, making them the most common cause of subclinical mastitis. The highest resistance of coagulase-negative staphylococci was found to penicillin G (58.33% of isolates). Full sensitivity of coagulase-negative staphylococci was found to amoxicillin / clavulanic acid (100% of isolates), a good sensitivity to ceftiofur (83.33% of isolates), cefalexin (70.83% of isolates) and ceftriaxone (41.66% of isolates).
AB  - Koagulaza negativne stafilokoke se smatraju oportunistički patogenim mikroorganizmima. Suzbijanje mastitisa izazvanih koagulaza negativnim stafilokokama je teško, zbog toga što epidemiologija bolesti nije jasna, a grupu koagulaza negativnih stafilokoka čini više od oko 40 različitih vrsta stafilokoka.  Stoga je cilj ovog rada bio da se ustanovi prevalenca koagulaza negativnih stafilokoka u mleku krava sa subkliničkim mastitisom, kao i da se ispita njihova osetljivost na odabrana antimikrobna sredstva. Mastitis testom je pregledano 112 muznih krava na farmi, gde je utvrđeno povećanje broja somatskih ćelija u zbirnom mleku sa farme. Iz 52 četvrti vimena krava, gde je mastitis testom utvrđeno povećanje broja somatskih ćelija uzeti su uzorci mleka za bakteriološki pregled. Za izolovanje uzročnika mastitisa korišćen je krvni agar. Identifikacija uzročnika mastitisa je urađena na osnovu izgleda kolonija na krvnom agaru i fizioloških osobina. Osetljivost koagulaza negativnih stafilokoka na uzročnike mastitisa je ispitana metodom po Kirbi Baueru. Za ispitivanje osetljivosti upotrebljeni su komercijalno proizvedeni diskovi koji su sadržavali: penicilin (10 IU), amoksicilin/klavulanska kiselina (20+ 10 µg), kloksacilin 25 µg, amoksicilin 30 µg, cefaleksin 30 µg, ceftiofur 30 µg, linkomicin 15 µg, gentamicin 30 µg i tetraciklin 30 µg. Osetljivost mikroorganizama je procenjivana na osnovu prečnika zone inhibicije prema preporuci proizvođača i označavana kao osetljiv (S) umereno osetljiv (I) ili rezistentan (R). Koagulaza negativne stafilokoke su izolovane iz 61,53% uzoraka mleka krava sa subkliničkim mastitisom, što ih čini najčešćim uzročnikom subkliničkih mastitsa. Najveći broj koagulaza negativnih stafilokoka je bio rezistentan na penicilin G (58,33% izolata). Svi izolati koagulaza negativnih stafilokoka su bili osetljivi na amoksicilin/klavulansku kiselinu, 83,33% izolata je bilo osetljivo na ceftiofur, 70,83% izolata je bilo osetljivo na cefaleksin i 41,66% izolata je bilo osetljivo na ceftriakson.
PB  - Vakultet veterinarske medicine, Beograd, Srbija
T2  - Veterinarski Glasnik
T1  - Finding of coagulase negative staphylococci in the herd with an increased number of somatic cells in milk and their antimicrobial susceptibility
T1  - Nalaz koagulaza negativnih stafilokoka u zapatu sa povećanim brojem somatskih ćelija u mleku i njihova osetljivost na antimikrobna sredstva
VL  - 67
IS  - 3-4
SP  - 175
EP  - 185
DO  - 10.2298/VETGL1304175K
ER  - 
@article{
author = "Katić, Vera and Rajić-Savić, Nataša",
year = "2013",
abstract = "Coagulase-negative staphylococci (CNS) are generally considered to be opportunistic pathogens. Controlling CNS mastitis is difficult because the epidemiology is not clear, and the CNS group consists of about 40 different Staphylococcus species. Therefore, the aim of this study was to determine the prevalence of coagulasenegative staphylococci in milk of the cows with subclinical mastitis, as well as to determine different CNS species isolated from quarter milk samples for their susceptibility to antimicrobials used commonly for mastitis therapy. On the farm where there was found an increase of somatic cells in bulk milk, 112 dairy cows were examined by mastitis test. From 52 udder quarters where mastitis test showed an increase of somatic cells, milk samples were taken for bacteriological examination. For isolating the causes of mastitis there was used blood agar. Identification of the causative agents of mastitis was carried out on the basis of colony appearance on blood agar and their physiological characteristics. Coagulasepositive staphylococci sensitivity which cause mastitis was tested by Kirby Bauer method. For susceptibility testing there were used commercially produced discs containing: 10 IU penicillin, amoxicillin/clavulanic acid (20 +10  g), cloxacillin 25  g, 30  g amoxicillin, cephalexin 30  g, ceftiofur 30  g, 15  g lincomycin, gentamicin and tetracycline 30  g. The sensitivity of microorganisms was evaluated on the basis of inhibition zone diameter recommended by the manufacturer and was labeled as sensitive (S) moderately sensitive (I) or resistant (R).  Coagulase-negative staphylococci were isolated from 61.53% of samples from cows with subclinical mastitis, making them the most common cause of subclinical mastitis. The highest resistance of coagulase-negative staphylococci was found to penicillin G (58.33% of isolates). Full sensitivity of coagulase-negative staphylococci was found to amoxicillin / clavulanic acid (100% of isolates), a good sensitivity to ceftiofur (83.33% of isolates), cefalexin (70.83% of isolates) and ceftriaxone (41.66% of isolates)., Koagulaza negativne stafilokoke se smatraju oportunistički patogenim mikroorganizmima. Suzbijanje mastitisa izazvanih koagulaza negativnim stafilokokama je teško, zbog toga što epidemiologija bolesti nije jasna, a grupu koagulaza negativnih stafilokoka čini više od oko 40 različitih vrsta stafilokoka.  Stoga je cilj ovog rada bio da se ustanovi prevalenca koagulaza negativnih stafilokoka u mleku krava sa subkliničkim mastitisom, kao i da se ispita njihova osetljivost na odabrana antimikrobna sredstva. Mastitis testom je pregledano 112 muznih krava na farmi, gde je utvrđeno povećanje broja somatskih ćelija u zbirnom mleku sa farme. Iz 52 četvrti vimena krava, gde je mastitis testom utvrđeno povećanje broja somatskih ćelija uzeti su uzorci mleka za bakteriološki pregled. Za izolovanje uzročnika mastitisa korišćen je krvni agar. Identifikacija uzročnika mastitisa je urađena na osnovu izgleda kolonija na krvnom agaru i fizioloških osobina. Osetljivost koagulaza negativnih stafilokoka na uzročnike mastitisa je ispitana metodom po Kirbi Baueru. Za ispitivanje osetljivosti upotrebljeni su komercijalno proizvedeni diskovi koji su sadržavali: penicilin (10 IU), amoksicilin/klavulanska kiselina (20+ 10 µg), kloksacilin 25 µg, amoksicilin 30 µg, cefaleksin 30 µg, ceftiofur 30 µg, linkomicin 15 µg, gentamicin 30 µg i tetraciklin 30 µg. Osetljivost mikroorganizama je procenjivana na osnovu prečnika zone inhibicije prema preporuci proizvođača i označavana kao osetljiv (S) umereno osetljiv (I) ili rezistentan (R). Koagulaza negativne stafilokoke su izolovane iz 61,53% uzoraka mleka krava sa subkliničkim mastitisom, što ih čini najčešćim uzročnikom subkliničkih mastitsa. Najveći broj koagulaza negativnih stafilokoka je bio rezistentan na penicilin G (58,33% izolata). Svi izolati koagulaza negativnih stafilokoka su bili osetljivi na amoksicilin/klavulansku kiselinu, 83,33% izolata je bilo osetljivo na ceftiofur, 70,83% izolata je bilo osetljivo na cefaleksin i 41,66% izolata je bilo osetljivo na ceftriakson.",
publisher = "Vakultet veterinarske medicine, Beograd, Srbija",
journal = "Veterinarski Glasnik",
title = "Finding of coagulase negative staphylococci in the herd with an increased number of somatic cells in milk and their antimicrobial susceptibility, Nalaz koagulaza negativnih stafilokoka u zapatu sa povećanim brojem somatskih ćelija u mleku i njihova osetljivost na antimikrobna sredstva",
volume = "67",
number = "3-4",
pages = "175-185",
doi = "10.2298/VETGL1304175K"
}
Katić, V.,& Rajić-Savić, N.. (2013). Finding of coagulase negative staphylococci in the herd with an increased number of somatic cells in milk and their antimicrobial susceptibility. in Veterinarski Glasnik
Vakultet veterinarske medicine, Beograd, Srbija., 67(3-4), 175-185.
https://doi.org/10.2298/VETGL1304175K
Katić V, Rajić-Savić N. Finding of coagulase negative staphylococci in the herd with an increased number of somatic cells in milk and their antimicrobial susceptibility. in Veterinarski Glasnik. 2013;67(3-4):175-185.
doi:10.2298/VETGL1304175K .
Katić, Vera, Rajić-Savić, Nataša, "Finding of coagulase negative staphylococci in the herd with an increased number of somatic cells in milk and their antimicrobial susceptibility" in Veterinarski Glasnik, 67, no. 3-4 (2013):175-185,
https://doi.org/10.2298/VETGL1304175K . .